S-90117A280 1/2"-20 x 2" ASME B18.3 Alloy Steel Wire-Lockable Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
• Exceptional tensile strength (170,000 psi) ensures reliable performance under high-stress applications
• Precision Class 3A fine threads provide superior fit and vibration resistance in critical assemblies
• Rockwell C37 hardness rating maintains structural integrity and prevents deformation during installation
• 3/8" hex drive design enables high-torque installation with standard industrial tools
• Full thread coverage along the 2" length ensures maximum engagement and load distribution
• Regulatory compliance with ASME B18.3, RoHS 3, and REACH standards for global manufacturing acceptance

Professional Applications & Engineering Value

These black-oxide alloy steel socket head cap screws deliver critical performance advantages in precision engineering applications where corrosion resistance and mechanical reliability are paramount. The Class 3A UNF fine threads provide exceptional clamping force retention in vibration-prone environments, making them ideal for machinery, automotive, and aerospace assemblies. The combination of 170,000 psi tensile strength and controlled hardness (Rockwell C37) prevents thread stripping and head deformation during high-torque installation. The black-oxide surface treatment creates a durable barrier against oxidation without significant dimensional changes, maintaining precise thread tolerances in critical fine-thread applications where standard coatings might compromise fit.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with precision Class 3A thread fit for superior engagement in UNF fine-thread applications. The 1/2"-20 thread configuration maintains strict dimensional control with 0.5" major diameter and 2" fully threaded length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial supply chains. The 3/8" hex drive and standard socket head profile guarantee compatibility with industry-standard installation tools and procedures.